I'm utterly confused.
FR24 basically has 2 modes of operation.
The normal mode is the PPI display (what most people know as a "radar screen") overlaid onto a map and shows all aircraft as icons. Additional information layers for each icon are selectable: e.g. Flight #, Airline, Registration, Altitude / Heading / Airspeed, Source and Destination. The extent to which these are selectable depends on if you're using the free version or if you've signed on for a membership (which brings additional perks).
The other mode is "Camera Mode" (they call it something else, but my phone is in the other room). You open the app in that mode and your camera screen is displayed. Wherever you point the camera, any aircraft within that viewing region will be displayed as described above, in the approximate position the aircraft would be with respect to your own field of vision, if you could in fact see it (you rarely can, because most of them are miles away).
TBH, I only use it in display mode. I don't much care about the camera thing.
Little known fact, for iPhone users:
You don't need an app to have fun with air traffic. At any time, ask Siri, "What airplanes are overhead". You'll get a shockingly immediate response on the phone display.